Callaway Gardens. It ain't cheap but it don't get much better!
They have deals on guided trips if you attend the S/E FFF council conclave at the end of May.
Besides good bluegill fishing, there are plenty of classes to hone your skills!
Link to the event: Southeastern Council - Federation of Fly Fishers

Lake Burton in the summer months produces alot of very nice sized bluegill, Moccasin Creek has alot of them on the lower section before it dumps into the Lake! We hooked alot of them on a size# 16 Parachute Adams or BWO's will work as well! Tight Line!